Regarding replay going out of bounds of the screen even when replayed on same device - eglretrace (using waffle)

[José Fonseca]

On Fri, Apr 11, 2014 at 12:02 PM, Arun Sl <arun.sl at tcs.com> wrote:

> Hello Jose,
>
> You are correct.
> inital frames have the call as follows:
>
> glViewport(x = 0, y = 0, width = 960, height = 540) {this fits phone
> screen correctly}
>
> while at a later stage I am getting the following calls in the same trace
> file.
>
> glViewport(x = 0, y = 0, width = 1366, height = 768) {this gives partial
> visual of an enlarged image on screen}
>

Isn't there a FBO bound when this call happens?

If the drawable truly has a size larger than the screen, then that's it
really. If the viewport is larger than the drawable then you really should
leave the viewport alone, and use vertex transformation to achieve the
zooming effect.

The issue here is that ApiTrace traces GL/EGL API calls. It does not trace
everything, such as windowing calls.  I'd like one day to encode the actual
drawable calls in the trace (e.g., with fake calls), but it's not high on
my todo list.

Jose


>
> Can I handle this situation in someway in apitrace?
>
> Thanks & Regards
> Arun S L
>
>
>  From: José Fonseca <jose.r.fonseca at gmail.com> To: Arun Sl <
> arun.sl at tcs.com> Cc: Apitrace list <apitrace at lists.freedesktop.org> Date: 04/11/2014
> 12:01 PM Subject: Re: Regarding replay going out of bounds of the screen
> even when replayed on same device - eglretrace (using waffle) Sent by: "apitrace"
> <apitrace-bounces at lists.freedesktop.org>
> ------------------------------
>
>
>
> eglretrace/glretrace infer the rendering size from glViewport calls (when
> no FBO is bound). See
> *https://github.com/apitrace/apitrace/blob/master/BUGS.markdown#retracing*<https://github.com/apitrace/apitrace/blob/master/BUGS.markdown#retracing>
>
> Maybe the game is using glViewport with sizes larges than the actual
> screen, misleading the egl/glretrace.
>
> Jose
>
>
> On Fri, Apr 11, 2014 at 3:34 AM, Arun Sl <*arun.sl at tcs.com*<arun.sl at tcs.com>>
> wrote:
> Hello All,
>
> I have tried to replay "Reign of Amira" on the same device as I took trace
> using eglretrace binary and waffle library (Android 4.2.2)
>
> The issue that I am facing is that after the initial logo of the game the
> replay goes beyond the screen size. I feel the game uses some call to
> change the resolution of the screen run time (this is my guess). Is this
> something we have to handle in code?
>
> If someone can give me hints appropriately in code, we can maybe improve
> the replay rendering.
>
> I was also thinking if we can use this mechanism to maybe replay games to
> the screen size(irrespective of which screen size the game is traced) /
> orientation of any device.
>
> Thanks & Regards
> Arun S L
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